Improvement in lamps



J. H. IRWIN.

LAMPa No.180,134. Patented July g5, 1876.

N4 FETERS, PHDTD-LITMQGRAFHER g'UNITED STATES v.PATENT OFFICE.

JOHN H. IRWIN, oF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN *.LAMPS. l

Specification forming part of Letters Patent N0. 180. [34, dated July25,1876; application filed Api-i1 1o, 1876,

To all whom zt may concern: f

, Be it known that I, JOHN H. IRWIN, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and usefulImprovement'in the Structure' Aof Tubular Lamps, which is fully setforthin rlhat others may fully understand my iin-l provement, l willparticularly describe it, having reference to the accompanying drawings,wherein- Figure l is a perspective view of my lamp, parts detached. Fig.2 is a. vertical section of the same.

A is the oil-pot, and B is an ordinary screw'- burner. The side of thcoil-pot is prolonged upward all around above the cover of the same, soas to form a an'ge, a, which constitutes the side or edge of theair-chamber C, which receives air onlythrough the draft-tube` D, whichalso serves as a convenienthandle for the lamp. I y

When the oil-pot'A is filled with oil, all the adjacent surfaces willsoon become covered with a film of oil, which, as is Well known, has

the capacity of creeping over adjacent surl faces toan indefiniteextent, and it is desiral ble that'the interior surface of the.air-chalnber C shall be accessible for the purpose of cleansingit, aswell as' the exterior surfaces y of the lamp. I therefore make the coverd of the air-|cha1nber removable, and secure it in place by thejacket E,which is rigidly attachedf. "f1- at its top to the burner B.' Thecover dhas a large circular orifice at its center. through whchthe air passesup under the jacket E, and thence underthe cone and' to the ange.Thedraft-tube D is con- Inectcd at its bottom with the air-chamberO,

vby thelateral duct or passage y, the edges of which curve outwardly asit approaches the chamber (J, so as to make a Wide entrance into Asaidchamber, and permit the vair-currents to move thereto without eddies orchan ge ofdirection. The central portion of the top plate of the duct gis extended into the ailfcllalnber, and its end soldered fast to theside of the oilfpot,

for the purpose of strengthen-ing and bracing the air-tube D.

Having described my improvement, what I" claiml as new is A` tubularlamp, substantiallyas decscribed, .provided with a removablev plate, d,for coverrn g the entire air-chamber, so that ac-v cess may be had totheinterior of saidchamber, for the purpose set forth.'

2. The removable cover d for the air-chamn ber C, combined with burnerprovided with a jacket, E, whereby said cover d may be kept in place,Vas set forth. V

l v J. H. IRWIN.

' -Witnessesz RICHARD H. REILLY, GHAs. F. R. HENcKEEoTH.

